K&N Filters Product Page. K&N Custom Air Filter Assembly with Cotton Material For Harley Davidson RK-3956. K&N Street Metal Air Intake Systems for Harley Davidson® motorcycles replace the restrictive stock OE air cleaner with an oversized K&N High-Flow Air Filter and a high-volume cast aluminum housing. If you’re looking for an aggressive appearance but want a significant increase in airflow, resulting in more power, this high-flow air intake system is exactly what your Harley needs. Installation is so simple, it can usually be done in 90 minutes or less. The K&N air filter is washable, reusable, pre-oiled and ready for installation. This intake system features an updated, modern look with an oval-shaped matte black housing. Silver details and sanded fins further enhance the streamlined look. Internal breathers provide a sleek, clean appearance. This air intake has a classic styling with a savage appeal. These K&N air intakes are street legal in most states. They are not legal for use in California and other states adopting California emission standards. Our Range of Products. Top 7 Reasons to Upgrade to a K&N Air Filter. Enhanced Performance: K&N air filters are designed to improve airflow, allowing your engine to breathe easier and generate more power. This can lead to noticeable gains in horsepower and acceleration. Cost Savings Over Time: Unlike disposable filters, K&N air filters are washable and reusable. Superior Filtration: K&N filters provide excellent filtration, protecting your engine from harmful particles and debris. This helps maintain engine health and performance. Easy Maintenance: Cleaning and re-oiling a K&N filter is straightforward and can be done at home. This convenience adds to the overall value and longevity of the filter. Eco-Friendly: By using a reusable filter, you reduce waste and contribute to a more sustainable environment. This is a small but impactful way to lessen your environmental footprint. Material: K&N’s reusable High-Flow Air Filter enhances performance by combining pleated, breathable cotton with their signature red filter oil. Unlike paper filters that clog quickly, K&N’s oiled cotton filter absorbs dirt and dust, allowing up to 50% more airflow. This ensures a continuous flow of clean air into your engine. Additionally, while disposable filters need replacement every 12-15,000 miles, K&N filters can last up to 100,000 miles before requiring cleaning under normal driving conditions. For over 50 years, K&N has been an industry-leader in automotive filtration and technology – offering products to increase performance, protection, and longevity in thousands of vehicle applications for consumers worldwide. K&N products are designed and manufactured on-site. K&N is headquartered in Riverside, California, in a building complex spanning nearly 400,000 square feet, and also operates facilities in Grand Prairie, TX, England, China, and the Netherlands. K&N facilities include departments for engineering, product design, manufacturing, warehousing, test facilities, purchasing, sales, customer service, marketing, and corporate offices. We despatch everyday Monday – Friday. All in stock orders placed before 2pm will be despatched the same day. For any more information please do not hesitate to get in touch. We do our best to have items listed that are in stock, feel free to get in touch if you want to double check. Acts of God and natural disasters. It is the customer’s responsibility to provide K&N with the intended application prior to installation.